Hoisting mechanism



H. B. HILLS. HOISTING MECHANISM. APPLICATION HLED DEC. I9, I919.

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WITNESS.-

H. B. HILLS.

HOISTING MECHAMSM,

APPLICATlON man we. 19. um.

I N V EN TOR.

Patented Feb. 1, 1921.

2 SHEhTi-SHEET 2 WITNESS:

.4 ATTOANEY.

UNITED STATES PATENT OFFICE.

nanny B. HILLS, or TOMPKINSVILLE, new YORK, assrenon fro STEWAR imvrr &. nourrnnnr CORPORATION, or new YORK, N. n, A CORPORATION or new YORK.

nors'rrne MECHANISM.

Specification cf lictters Patent.

Patented Feb. 1., 1921.

Application fi1ec1 December 19. 1919. Serial No. 346,013.

To all whom it may concern:

Be it known that I, HARRY B. I'IILLS, a citizen of the United States, residing at Tompkinsville, in the county of Rlchmond and State of New York, have invented certain new and useful Improvements in Hoisting Mechanisms, of which the following is a specification.

My invention relates to holstmg mechanisms such as are commonly used for raising and lowering a load, as for example a life boat. I will describe a hoisting mechanism embodying my invention, and then point out the novel features in claims.

In the accompanying drawings, Figure 1 a top plan View of a hoisting mechanism embodying my invention and showlng ts use in connection with a pair of ships davlts to launch and deck a life boat. The ships davits are shown in cross-section. Figs. 2

and 3 are detail views of the hoisting mech anism shown in Fig. 1. In Fig. 2 the section is on the line 22 of Fig. 3, and in Fig. 3 the section is on the line. 3-3 of Fig. 2, the two sections being in planes at right angles to each other.

Similar reference characters designate corresponding parts in all of the figures.

Referring to Fig. 1, A designates a life boat which rests upon a deck of a vessel between ships davits B, B. The davits B, B, may be of any desired construction, an example of which is shown in U. S. Patent No. 1,245,752 granted to T. H. Marten, D ecember 24:, 1914. The function of the davits B, B, is to carry the boat A outboard to a position from which it can be lowered into and raised out of the water. C designates a mechanism for raising-and lowering the life boat from the davitsf It comprises a reel for the ropes or falls 0 0 One rope 0 passes from one portion of the reel 0 around blocks 0 a, secured to the deck, around a block carried by the eye of the r clavit (not shown) and to one end of the life boat A. The other rope 0 passes around a block 0 secured to the deck, around a block carried by the eye of the second davit (not shown) and to the other end of the life boat.

Referring now to Figs. 2 and 3 which show details of the hoistin mechanism, the reel 0 is secured to a sha t .d which is suitably journaled in a pair of standards d which are joined together by cross-pieces d for the purpose of forming a stilf support. The reel 0 is provided at one end with a gear 0 or that end of the reel may be formed with gear teeth, with which meshes a gear fixed on a shaft 6 which is suitably journaled in brackets secured to the standards al A pair of cranks 6 may be employed for rotating the shaft 6 when it is desired to lift a life boat from the water onto the deck of the vessel.

F designates a brake drum which is loosely mounted on the shaft (Z roller or other anti-friction bearings being provided between the drum and shaft. The usual brake band f is provided 011 the braking surface of the drum, and the usual control lever fcarrying the weight 7.0 is also providedfor the brake band. The inner surface of the brake drum is provided with ratchet teeth F, with which cooperate pivoted pawls f carried by the reel 0. As will be seen from Figs. 2 and 3, the drum is open at the side adjacent the reel 0 so that the pawls can cooperate with the ratchet teeth f Stops f are provided for limiting the movement of the pawls on their pivots and thus insure their engagement with the ratchet teeth F.

The operation of the hoisting mechanism is as follows-When a load is to be lowered the reel 0 and brake drum F rotate together in the direction of the arrow as (Fig. 3). This is so because in this direction of move ment the lower pawls f are in engagement with the ratchet teeth F. In this direction. of rotation the lowering of the load is directly under the control of an operator throu h the control lever f and brake-band f. A er the load has been lowered, in this instance the life boat, the ropes are detached therefrom. The ropes or falls are then recovered by applying the cranks to the squared ends of the shaft (Z and rotating the reel 0 directly instead of through the gear 0 In this operation the control lever f is released, and the weight w imposes suflicient pull on the brake band to hold the brake drum against rotation. Therefore the reel 0 being rotated in a direction opposite to that indicated by the arrow, the pawls f ride idly over the ratchet teeth f After the ropes or falls are recovered another boat or load may be lowered as before described.

Having thus described my invention what I claim as new is 2- 1. In combination, a reel; gear teeth thereon by means of Which it is rotated in one direction; a plurality of gravity operated pawls carried by said reel and equally spaced apart; a drum adjacent the reel; ratchet teeth carried by the drum and With Which any one or more of the pawls engage to cause the reel and drum to move together in one direction of rotation of the reel; and a brake band surrounding the drum.

2. In combination, a reel; gear teeth thereon; gravity operated pawls carried by the reel; a brake drum having an open side adjacent the reel; ratchet teeth carried by the drum and with which the pawls engage through said open side to cause the reel and brake drum to rotate together; and means for holding the brake drum against movement in one direction of rotation of the reel.

HARRY B. HILLS.

Witnesses I ELLIS G. JosnrH, CHARLES L. F LEECE. 

